Show Making VOICE Like CANNONS CANNON'S ROAR MANS MAN'S voice can be made as loud as the A cannons cannon's roar it can be heard two or twenty twenty twenty ty miles The ticking of a watch can be amplified until it sounds like breakers on an ocean cliff Wireless telephone operators say that it is no trick at al all to magnify sound f four ur or five million times or indefinitely All that is needful is to oto connect a number of vacuum valves in multiple with a wireless receiving set and the thing is done done At th the first receiving contact a voice will willbe willbe willbe be normal Cut in one vacuum valve and it is raised seven times time thereafter it squares itself itself- itself itself- seven times seven to 49 40 for the next Vacuum valve alve and and 49 times 49 for the next t and so 50 on Volume of sound is meant not power of trans trans- mission In a test recently conducted in San Francisco F a phonograph was connected with an amplifier to supply all the city with son song and amusement when the police olice urged the experimenters to desist In the stadium m at Golden Gate Park the tick tick- I Ia a I jf I o i y 1 t F fr J u 1 J I. I V o cr J r q t i ing lag of a watch was made a audible dible all over the grand stand while an athletic meet was in ress Capt Robert obert W Vo A. A Brewer an experimenter experimenter experimenter menter moved off 2000 feet and spoke quietly to his dog and find the dog couldn't be held A wireless wireless' station recently received a telephone message from Europe and through its amplifier startled duck hunters in the marshes i ht miles away The exterior of the vacuum valve used to amplify sound resembles an ordinary candle IG electric light bulb Through the glass however r can be seen electric windings that are dissimilar Around a filament are arc wound convolutions of wire called a grid Above e bo the grid is an en encircling metallic plate pInte The current it is explained passes through each in the order described The incoming incoming in ing wireless ireless signals travel down the aerial wire to the tuning set and then to the vacuum n valve which is detector a or receiver For pra practical purposes the vacuum valve has Its use ns liS in war warships fps ps where the wireless telephone telephone tele tele- phone speaks its mes message age through a horn to several several several sev sev- eral officers instead of to one using earpieces It can be availed of to address audiences Newspaper F ture S 1911 1919 I I 1 ij i 4 yo o r. r t 1 t or i r KhoV j t J t. t 11 y l r 0 t f ri j r r 1 Jd h |